Microstructure and electrical properties of Lu_2O_3-doped ZnO-Bi_2O_3-based varistor ceramics  

作　　者：徐东 史小锋 程晓农 杨娟 樊曰娥 袁宏明 施利毅 

机构地区：[1]School of Materials Science and Engineering,Jiangsu University [2]Research Center of Nano Science and Technology,Shanghai University [3]State Key Laboratory of Inorganic Synthesis and Preparative Chemistry,College of Chemistry,Jilin University

出　　处：《Transactions of Nonferrous Metals Society of China》2010年第12期2303-2308,共6页中国有色金属学报（英文版）

基　　金：Project(50902061)supported by the National Natural Science Foundation of China;Project(2011-22)supported by the State Key Laboratory of Inorganic Synthesis and Preparative Chemistry of Jilin University,China;Project(20100471380)supported by the China Postdoctoral Science Foundation;Project(J50102)supported by the Leading Academic Discipline Program of Shanghai Municipal Education Commission,China;Project(10KJD430002)supported by the Universities Natural Science Research Program of Jiangsu Province,China;Project(2010002)supported by the Jiangsu University Undergraduate Practice-Innovation Training Program,China

摘　　要：Lu2O3-doped ZnO-Bi2O3-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900-1 000°C,and the microstructures of the varistor ceramics samples were characterized by X-ray diffractometry(XRD)and scanning electron microscopy(SEM);at the same time,the electrical properties and V-I characteristics of the varistor ceramics samples were investigated by a DC parameter instrument for varistors.The results show that the ZnO-Bi2O3-based varistor ceramics with 0.3%Lu2O3(molar fraction)sintered at 950°C exhibit comparatively ideal comprehensive electrical properties.The XRD analysis of the samples shows the presence of ZnO,Bi-rich,spinel Zn7Sb2O12 and Lu2O3-based phases.Lu2O3-doped ZnO-Bi2O3-based varistor ceramics samples were prepared by a conventional mixed oxide route and sintered at temperatures in the range of 900-1 000°C,and the microstructures of the varistor ceramics samples were characterized by X-ray diffractometry（XRD）and scanning electron microscopy（SEM）;at the same time,the electrical properties and V—I characteristics of the varistor ceramics samples were investigated by a DC parameter instrument for varistors.The results show that the ZnO-Bi2O3-based varistor ceramics with 0.3%Lu2O3（molar fraction）sintered at 950°C exhibit comparatively ideal comprehensive electrical properties.The XRD analysis of the samples shows the presence of ZnO,Bi-rich,spinel Zn7Sb2O12 and Lu2O3-based phases.

关 键 词：ZnO-Bi2O3 ceramics VARISTOR rare earth electrical properties 

分 类 号：TQ174.1[化学工程—陶瓷工业]